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Tilda Swinton sleeping in the performance art piece ‘The Maybe’ at New York’s Museum of Modern Art this morning. (Richard Drew/AP Images)

Here’s what happens when the personal intersects with the professional: a celebrity sighting turns into an Anglophenia post.

As I was walking home from the subway on Manhattan’s Upper West Side yesterday night about 10 p.m., I spotted a slim sharp-boned woman, her pale blond hair in a short severe cut, walking south on West End Ave. with a man.

Why, that’s Tilda Swinton, I thought to myself. I was close enough that, upon overhearing a snatch of her conversation with the familiar accent, my sighting of the Scottish actress was confirmed.

This morning, I opened my laptop and Googled Swinton, figuring I’d find out that she was in town shooting a movie. What I discovered is way better.

News reports had just been filed that the Oscar-winning star is taking part in an exhibition at Manhattan’s Museum of Modern Art in which she, periodically throughout this year, will pop in to sleep on a mattress in a transparent box in front of museumgoers.

It’s a recreation of her 1995 performance piece, “The Maybe.” Her first performance at MOMA was over the weekend, and attendees included actor James Franco.

The museum didn’t publicize the project ahead of time and has made no announcement about when she will be stopping by again to catch up on her zzzz’s.